Indoor radon concentrations were measured in four well-known spas of Tunisia using
nuclear track detectors. The radon concentrations in these spas were found to be in the
range of 19 - 870 Bq.m-3. The equilibrium factor F between radon and its
progeny was found to vary in the range of 0.2 - 0.5, depending upon the ventilation rates
within the buildings of the spas. Using the exposure-dose conversion factor, the effective
doses to patients and workers were estimated and the dose was found to vary in the range
3.7 × 10-3 - 12.5 × 10-3 mSv.y-1 and 0.45 - 1.5 mSv.y-1
for patients and workers, respectively. These values are well inside the limit recommended
for the annual dose limit of 20 mSv.y-1 for an occupational worker. The radium
content in the groundwater of all four spas was measured and the results showed no
correlation between the 226Ra concentration in water and radon concentration in
indoor air of the investigated spas.